If you have been successful at training J.R.'s you ought to stick to you game plan with this new dog and be just fine. You could stick him on a few canned hunts for pigs while blood training, just so he knows which side of a live pig is the dangerous one. But once he's achieved some level of success at trailing and he finds a wounded hog at the end of the blood trail I'm pretty sure bulldog nature will take over and you better get to him quick.
Good luck, happy hunting
Pretty sound advice right here.